William Edgar Thomason was born in 1872, and died on April 13, 1938.
He is buried at Oak Grove Cemetery in Nacogdoches, Texas.
At the time, district 3 was composed of Nacogdoches County, Texas.
He continued to represent House District 7 until he left off on January 9, 1923 being succeeded by William Scott Crawford.
On January 8, 1929, Thomason was sworn into represent district 3 of the Texas Senate succeeding I.D.